My client recently purchased a E650 Orange Smartphone from the UK. When connecting to our Exchange 2003 server I receive the error 'security certificate on the server is not valid' error 0x80072F0D. The certificate installed on Exchange server is from Equifax Secure Global, who is owned by GeoTrust. I downloaded the only root certificates I could find and those were at GeoTrust. I installed them but to no avail. When I go to https://webmail.mydomain.com/oma I received the prompt 'The name, date, or issuing authority for the site's security certificate is not valid' All suggestions would be appreciated.